Sand

This isn't really a recipe.  It's more of a technique.  Take any kind of crunchy cookie (no filling, so Fig Newtons are Right Out) or baked pate sucree or sablee or a chocolate cookie and whir it into dust/sand in the food processor.  Use it as a base for a quenelle of ice cream so it doesn't scoot all over the plate.  Sprinkle it around as a garnish.  Layer it with custard or ice cream to make a parfait.  So simple, but striking, plus it adds another textural element to your plate.